OP I've been there. I was a bit older than you and had two children. the difference is that I did get pregnant, amazingly 1st time trying but miscarried and then nothing. Went for tests, expected issue to be with me, it wasn't. I was more upset than he was. We talked about IVF, decided to wait and save, had appointments, more tests, and then OH admitted that through that whole process, he'd decided that he was sure about being a father any longer. It was a massive blow in every aspects.
In the end, we compromised on trying naturally as part of him still wanted it. We knew it was not impossible since it had happened, just that odds were against us. I did everything, absolutely everything to increase the odds but it just didn't happen. For a couple of years, I cried or felt really low each month and then gradually it got a bit easier until I reached the point when I actually found myself happy to be childfree, really.
One thing for sure though, I have NEVER considered leaving my partner. The problem was never his, it was ours as a couple.Yes I wanted to be a mum again, but not so much that I would have given him up, otherwise, I would have just gone the donor route before I met him.
I can understand considering leaving if it meant never experience motherhood at all, but you do have a child already. You are more fortunate than some people who can't be.
I have to say that as others posters have written, if this is really how you feel, your OH is better off without you. Maybe you can tell him how you fell and let him decide?